Topic: Any topic you want with the following parameter—your main statement must detail an argument that is both provable and controversial (some educated, thoughtful people would disagree).
As an example, “The State of Kentucky should end the death penalty because of unfairness in its application” would be a good main statement. It is possible to show that the death penalty is applied unfairly, but thoughtful, educated people could argue for keeping it.
Prepare main statement that must detail an argument that is both provable and controversial.